The story line of Region of Terror is not build up on the main character. It follows the NPC Drizzt Do'Urden, who joins your party at the Irenicus' Dungeon area. Drizzt is the most famous character of fantasy writer R. A. Salvatore.

This was originally meant to be a Drizzt Mod, and that is what it became. The mod adds Drizzt, Wulfgar, Regis, Catti-Brie, Bruenor, Entreri and Jarlaxle into the game as playable NPCs. The main story was pulled from a hat but the main idea is that you rescue Drizzt's friends and witness the final confrontation of Drizzt Do'Urden and Artemis Entreri. If you are evil, you can betray Drizzt and help Entreri. The mod also contains an arena where you can go and fight for rewards. Mages and fighters can participate. There are also over 10 new large quests (total quest amount 30+) and other special features.

There are many smaller quests and some of the quests have different possibilities for endings, including the main story. More information can be found on the website.

- 35+ new quests
- Big main story involving Drizzt and the main character
- 30-40 hours of additional gameplay
- Hundreds of new items
- New spells (mostly kit-specific)
- 20+ new kits
- 160+ new areas
- 10 new NPCs
- Special features
- Mod maker's house (Use codes and enter area "RA4400")
- SECRETS!!!!